This Part Fits the following kits / parts:

#88037 - ワンウェイディファレンシャルセット (E10)

取り付けには 88060 ユニバーサルドライブシャフトセットが必要です

Discontinued

Optional One-Way Differential Set for the E10.

A one-way diff features unique bearings that allow the out drives
to spin in only one direction. This allows the drive axles to turn
the wheels to provide forward drive, but doesn't allow the wheels
to brake.